Cartridge-shell.



No. 678,628. Patemd July la, lool.' P. SALISBUBY. CARTRIDGE SHELL.

(Application tiled Nov. 3, 1900.) (No Model.)

AtEs

GEORGE P. sALIsEURY, CE NEW HAVEN, CONNECTICUT, AssIeNoR To THE WESTERN CARTRIDGE COMPANY, OF EAST ALTON, ILLINOIS.

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sEEcrEIcArIoN forming part of Letters :raten/ No. 678,628, dated. Jury' ie, 190i. Application il'ed November 3j 1900. Serial No. 351338 (N6 model-5 To @ZZ zzz/1.0771, t may concern:

Be it known that I, GEORGE P. SALISBEY, a

citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut,have invented certain new and useful Improvements in OartridgeeShells, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. l In shells as ordinarily made it frequently happens that fire when the gun is discharged Will burn. through the paper shell directly beyondthe edge of the metal head, thus allowing gases to pass into the space between the cartridge and the barrel of the gun, and as these gases escape through the breech of the gun the efficiency of the firearm is to this eX- tent diminished. It has also been found in practice that when the base-wads are formed to extend outwardly beyond the edge of the metal head, as shown in the drawings of this application, the fire will sometimes burn through both the base-wad and the shell and at other times the gases will pass backwardly between the base-wad and the shell and then forwardly between the shell and the metal head and thence out through the breech of the gun.

To avoid incidents of this character is the object of rnyinvention; and to this end it consists in features of novelty hereinafter fully described, and pointed out in the claim.

Figure I is a perspective View of the tape that forms the base-wad of the shell. Fig. II

is an enlarged section of the tape fully wound up. Fig. III is'an enlarged section showing the firing end of the completed shell.

Referring to the drawings, l represents the paper shell of the cartridge, 2 the metal head and 3 the base-wad, all of which except in s o far as the wad is modified or changed by my invention'as hereinafter set forth are made and arranged in the usual Well-known way,

the wad consisting of a tape 4, coiled into a 1 leaving several coils of the wad undisturbed, 5o

thus leaving a iiange 7 of the wad,that extends into the shell beyond the edge of the metal head. The part of the wad that is forced down into the base of the shell is compressed into a hard compact mass that presses the inner edge of the paper shell into the enlargement of the metal head, asV shown at 8, Fig. III.

Myinvention consists in coating or saturating the part 7 of the base-wad with paraffin or some like substance which will render it im- 66 pervious to the ire to which it is subjected but the fractional part of a second only and which keeps this part of the wad in a soft elastic condition, so that when the explosion occurs this part of the wad will be forced tightly against the inner wall of the shell, thus preventing the passage of gases rearwardly between the wad and the shell, as described. I prefer to thus treat the part '7 of the wad before the tape is coiled into a roll, as shown 7o in Fig. I. Experience has demonstrated the fact that this treatment of the part 7 of the wad avoids the objections that I have described.

I claim as my invention- A base-wad comprising a tape, one end of which is treated with paraffin extending approximately one-half of the width of said tape, all other portions of the tape being untreated.

GEO. P. SALISBURY. In presence oli- J. V. MoULToN, F. W. OLIN. 

